rail trail from Northampton to East Penn, question if you have experience with it

I find myself with a morning of spare time tomorrow, and a new Surly Ogre, so I figured I'd explore some towpath that I haven't experienced yet.

Using this as a guide:

http://www.delawareandlehigh.org/index.php/trail/

...I was thinking of riding from Northampton up to East Penn, and back. But I have to be back in time for an afternoon date w/ my wife or I'm dead, so my question is, is it fairly easy to follow? In that stretch, are there any areas where you have to go off the trail at all? I was hoping to just crank mindlessly as I follow a path.